HomeFish encyclopediaRay-finned fishesCarpsSuckersBlue sucker Blue sucker (Cycleptus elongatus) Scientific name: Cycleptus elongatus Lesueur, 1817 The Blue sucker (Cycleptus elongatus) is a freshwater fish of the family Catostomidae. BiologyInhabits strong current in deep (1-2.5 m) chutes and main channels of medium to large rivers over bedrock, sand and gravel.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameCycleptus elongatusFamilyCatostomidae (Suckers)OrderCypriniformes (Carps)ClassActinopterygii (Ray-finned fishes)Maximum length93.0Common length66.5EnvironmentFreshwater; benthopelagicClimateSubtropicalDistributionNorth America: Mississippi River basin from Pennsylvania to central Montana and south to Louisiana, USA; Gulf Slope drainages in the USA from Mobile Bay, Alabama to Rio Grande in Texas and New Mexico, and in Mexico.Conservation status (IUCN)Lower Risk: near threatened (LR/nt)Threat to humansHarmlessResilienceLow, minimum population doubling time 4.5 - 14 years (tmax=13) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026